<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../vue.js"></script>
</head>

<body>
  <div id="app">
    <div>{{count}}</div>
    <button v-on:click="count+=1">累加</button>
    <button v-on:click="add">累加</button>
  </div>
  <script>
    Vue.config.productionTip = false;

    const vm = new Vue({
      el: "#app",
      data() {
        return {
          count: 1
        }
      },
      methods: {
        add() {
          this.count++
        }
      }
    })
  </script>
</body>

</html>